I went to AI Connect and Fannie Mae had a rep there talking about CU. I am not 100% sure I heard him correctly, but my impression was, that their algorithm is more reliable (in their opinion) than appraiser adjustments and that when push comes to shove, they will default to them. This means that if Fannie's algorithm indicates $100 per sqft is the correct adjustment, but the appraiser, through the use of paired sales, grouped data, depreciated cost, sensitivity and whatever other means they use says it is $70 per sqft, Fannie wins. I really hope I misinterpreted this comment. Since I am sure that the powers that be at Fannie read these threads, perhaps they can chime in?